The prodigal son has returned: strongman Ali Abdullah Saleh's political swivel towards Riyadh could change the face and future of the war in Yemen, isolating his onetime allies the Huthis.

The rebel alliance controlling Yemen's capital appeared to be crumbling Saturday as a strongman opposed to the internationally recognised government reached out to the Saudi-led coalition fighting the insurgents.

Gaza's quasi civil war of 2006-2007 killed hundreds of people and opened rifts between Palestinian political movements Fatah and Hamas which are still felt today.

Syria's long-running civil war may be winding down slowly, but the country is awash in weapons and a confounding array of local militias and thousands of foreign troops, some of which may never leave.

With crucial aid from allies Iran and Russia, President Bashar Assad has regained control over large areas of Syria in advances that appear to have put to rest the possibility of a military overthrow, at least for now. But his rule is extremely reliant on continued assistance from Iranian-sponsored militias, which have spread across the war-ravaged country.

The UN plan that partitioned Palestine into two states, one Jewish and one Arab, was adopted 70 years ago.

Russia has been a staunch diplomatic, military and political supporter of President Bashar al-Assad since the Syrian conflict began in 2011.

Fifty years ago, the UN adopted a resolution on an Israeli withdrawal from occupied territories that remains the reference for peace in the Middle East, even though it has never been implemented.

UN peacekeeping hit a rock-bottom low when blue helmets in Bosnia failed to prevent the Srebrenica massacre in 1995, a year after peacekeepers pulled out of Rwanda as it was convulsed by mass atrocities.

The debacles in Bosnia and Rwanda loom large over UN peace operations to this day and have brought about a shift toward more robust missions focused on protecting civilians. 

Its "caliphate" has imploded, its de facto capitals in Iraq and Syria have fallen, and hundreds of its fighters have either surrendered or fled.

France under President Emmanuel Macron has played a lead role in trying to avert a fresh crisis in Lebanon amid claims that its prime minister Saad Hariri was being detained in Saudi Arabia.